Here is another great, easy, cheap activity I put together for our upcoming road trip. The activity simply involves sticking the pipe cleaners through the holes. For older kids it can also be a color matching game (stick the correctly colored pipe cleaner through its coordinating hole.) I found the idea for this here.
In order to make this for your own toddler, take an old canister (chip or oatmeal containers work great) and pop holes in the top. I found using a pen or thick nail worked much better than a knife. Add reinforcement labels to each hole and color them if desired. Since my daughter is so young my final step was to fold each pipe cleaner in half to make it easier for her. Easy right?